Unit 4 - Light Waves Pre-Test

1. What does the letter E indicate int the following diagram?

• A. The wave's wavelength.
• B. The peak of the wave.
• C. The amplitude of the wave.
• D. The wave's trough.

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NGSS.MS-PS4-1

2. What is the letter A indicating in the following diagram?

• A. The wave's wavelength.
• B. The peak of the wave.
• C. The amplitude of the wave.
• D. The wave's trough.

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NGSS.MS-PS4-1

3. What is the difference between digital and analog signals?

• A. DIGITAL signals are continuous and can be any value; and ANALOG signals are not continuous and jumps between distinct values.
• B. ANALOG signals are continuous and can be any value; and DIGITAL signals are not continuous and jumps between distinct values.

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NGSS.MS-PS4-3

4. Which wavelength is digital and which is analog?

• A. B is a DIGITAL wavelength
• B. B is a DIGITAL wavelength and A is an ANALOG wavelength.
• C. A is a DIGITAL wavelength and B is an ANALOG wavelength.
• D. Neither are DIGITAL or ANALOG

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NGSS.MS-PS4-1

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5. These graphs show the wavelength and amplitude of light coming from three lasers. Could any of these lasers be giving off a different type of light?

• A. Yes. Laser 2 could be giving off a different type of light because Laser 2 has a different wavelength than Lasers 1 and 3.
• B. Yes. Laser 3 could be giving off a different type of light because Laser 3 has a different amplitude than Lasers 1 and 2.
• C. Yes. All three lasers must be giving off different types of light because every light source gives off its own type of light.
• D. No. All three lasers must be giving off the same type of light because all three are lasers, and the same kind of light source gives off the same type of light.

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NGSS.MS-PS4-1

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6. Dentists use a soft, clay-like material to make a filling for a cavity. The filling stays soft under the light of the dentist’s lamp, but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling when light from the lamp does not?

• A. Because ultraviolet light carries energy, and light from the lamp does not.
• B. Because the filling material can absorb energy from ultraviolet light, but not from the light from the lamp.
• C. Because ultraviolet light pulls energy out of the filling material, and light from the lamp does not.
• D. Because ultraviolet light carries hardening molecules, but light from the lamp does not.

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NGSS.MS-PS4-2

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7. Ian wonders if sunscreen lotion will dry out if it is exposed to light. The table below shows what happens when different types of light hit the sunscreen. Based on this information, which type of light is more likely to dry out the sunscreen?

• A. The ULTRAVIOLET LIGHT because it bounces off of the sunscreen which means that it has more energy
• B. The X-RAY LIGHT because it can pull energy out of the sunscreen when it passes through the sunscreen.
• C. There is no way to know
• D. Neither type of light because the sunscreen does not absorb energy from either the ultraviolet light or the X-ray light.

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NGSS.MS-PS1-2

8. Using the image provided below, which wave would produce more energy?

• A. WAVE A: because it has a low amplitude.
• B. WAVE B: because it has a high amplitude.
• C. BOTH WAVES would produce equal amount of energy.

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NGSS.MS-PS4-1

9. What is a simple wave?

• A. The ones in the ocean
• B. Curvy lines
• C. A repeating pattern that carries energy.
• D. A pattern that carries matter.

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NGSS.MS-PS4-1

10. What is a better way to encode data?

• A. Using either a digital or analog wave.
• B. Using an analog wave.
• C. Using a digital wave.
• D. Using a landline

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